Carburetor



Oct. 31, 1933. D. CQLE E1; AL

CARBURETOR Filed March 18, 1951 A TTORNEY.

Patented Oct. 31, 1933 CARBURETOR 7 Don Cole, Evanston, Ill., andLeonard E. Bogue,

South Bend, Ind.;

T OFFICE said Bogue assignor to Bendix Stromberg Carburetor Company,South Bend, Ind., a corporation of Illinois Application March18, 1931.Serial No. 523,476

3 Claims. (Cl. 261-72) This invention relates to carburetors and moreparticularly to a means for venting the car'- buretor float chamberbowl.

An object of the invention is to vent the float chamber in 'a manner to.subject it to the pressure present in the carburetor air intake horn.

Another object is to provide a carburetor with an air vent which may beformed in the carburetor body.

Another object is to provide a carburetor with float chamber ventpassages thatmay be formed in mating surfaces of the carburetor bodyunits.

A feature of the invention relates to a passage in the throttle bodyportion which partially encircles the mixing chamber and connects thefloat chamber with the air horn. The passage is preferably formed in theshape of a groove on the under side of the throttle body surface whichforms a closed conduit when the main body and throttle body are in theirassembled position.

- Other objects and features of the invention will be apparent from thefollowing description of one embodiment which I have illustrated in theaccompanying drawing in which: 1

Figure 1 is a side elevation partly in section of a carburetor showingthe improved float chamber venting; and

Figure 2 is a sectional view taken on lines 2-2 of Figure 1 showing theextent of the venting groove in thethrottle body.

Referring to the drawing, 10 is a carburetor having a throttle valve 12,a float chamber 14, and an air intake horn 16'. Float chambers arenormally vented to the atmosphere, but it has been found desirable insome cases to have the pressure in the float chamber bowl equal to thatexisting in the carburetor air horn so that the differential in pressurebetween the mixing chamber 16 and the float chamber bowl is not changedby restrictions such as air cleaners and silencers which are sometimesinstalled at the air horn entrance. the pressure in the float chamberbowl increased with the air flow and for that reason, I prefer toarrange the intake from the air horn in a plane perpendicular to the airflow whereby the kinetic pressure will be transmitted from the air hornto the float chamber.

tion 26 is provided on its under surface with a It is also desirable attimes to have groove 28 which partially encircles mixing chamber 16 andconnects with an opening 30 formed adjacent the float chamber bowl andis in communication therewith by means of pipe 32. A gasket 34 ispreferably positioned between the two body portions of the carburetortoform a tight closure and if desired, a screw 36 may be used to locktube 18 in position.

It may be readily seen from the above descriptionthat we have provided aventing conduit for a float chamber 14 in which both the static andkinetic pressures existing in air horn 16 are transferred through anintegral conduit around mixing chamber 16 to the float chamber 14. 7

While we have illustrated and described a preferred form of theinvention, it is understood that this showing and description areillustrative only, and that we do not regard this invention as limitedto the form shown and described, or otherwise, except by the terms ofthe following'claims:

We claim:

1. A carburetor comprising, a main body portion having a float chamberand an air horn, said air horn having a passageway terminating in theupper surface of the body portion, a throttle body portion having agroove in its lower surface overlapping said passageway and forming aconduit between the passageway and float chamber.

"ing a float chamber and an air horn, an air conduit having an inlet inthe air horn, and a second body section having a throttle, one of saidbody sections being formed with a groove coopcrating with a surface ofthe other section to form a connection between the conduit and the floatchamber.

DON COLE. LEONARD E. BOGUE.

